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合成了一类以立体位阻樟脑基衍生物作为辅助配体的环金属铂(II)配合物并对它们的化学结构、晶体结构和发光性质进行了表征.这类新化合物的结构简式为:ppyPt(O^O),ppy表示主配体(2-苯基吡啶),O^O表示在樟脑基3位上具有不同乙酰取代基团的位阻β-二酮.单晶结构研究表明,虽然这些配合物同其他具有简单β-二酮(如乙酰丙酮等)的环金属铂(II)配合物一样具有正方形的平面构形,同时配合物分子间也具有平面堆积模式,但是,由于配合物中的樟脑基团具有很大的空间位阻,致使配合物的分子平面之间产生相互错动,配合物分子中的芳香环基团不能产生有效的重叠,所以这些配合物具有非常弱的π-π相互作用.分子平面的相互错动也使得金属铂之间产生很大的距离(Pt-Pt最短距离超过6?).这些结果都表明在β-二酮中引入樟脑基团能够有效降低分子间π-π相互作用和Pt-Pt相互作用.溶液发光光谱的研究表明,除配合物2外,这些化合物具有较高的磷光效率.同时,这些配合物的固体发光光谱具有结构发射特征,最大发射波长仅比相应的溶液发光光谱相差几个纳米,表明分子间没有激基复合物产生.分子间非常弱的π-π相互作用、有结构的固体发光性质和较高的磷光效率表明在掺杂磷光发光器件甚至在非掺磷光发光杂器件中,这类磷光材料都具有潜在的应用价值.
A series of platinum (II) complexes were synthesized and their chemical structures, crystal structures and luminescent properties were characterized. The structural formulas of these new compounds are as follows: : ppyPt (O ^ O), ppy represents the main ligand (2-phenylpyridine), O ^ O represents a sterically hindered beta-diketone with different acetyl substituents at the 3-position of the camphor. . Although these complexes have the same square planar configuration as the other platinum (II) complexes with simple β-diketones (such as acetylacetonate) and have planar stacking modes between complex molecules, The camphor groups in the complex have a great steric hindrance, resulting in mutual mismatch between the molecular planes of the complexes and the aromatic ring groups in the complex molecules can not effectively overlap, so these complexes have very weak Of the π-π interaction. The mutual inversions of the molecular planes also lead to a large distance between the metal platinum (Pt-Pt shortest distance more than 6?) These results indicate that the introduction of β-diketone groups can camphor Effectively reduce the intermolecular π-π interaction and Pt-Pt interaction . The luminescence spectra of the solution show that these compounds have higher phosphorescent efficiency than the compound 2. At the same time, the solid-state luminescence spectra of these complexes have structural emission characteristics, the maximum emission wavelength is only a few than the corresponding solution luminescence spectrum Nm, indicating that there is no exciplex produced between the molecules.The very weak π-π interactions between molecules, the structured solid luminescence properties and the higher phosphorescent efficiency indicate that even in the non-doped phosphorescent light emitting devices In these phosphorescent materials have potential applications.